Spring harrow-tooth



(No Model.)

A. P. SPRAGUE. Spring Harrow-Teeth.

No; 227,593; Pat ented May 11, I880.

WITNESSES: v IgIVENTOR: 6% r v BYME ATTORNEYS.

".PETERS, FHOTO-LITNOGRAPHEH. WASHINGTON. D. O

UNITED STATES PATENT OFFICE.

SPRING HARROW-aTOOTH.

SPECIFICATION formingpart of Letters Patent No. 227,593, dated May 11,1880.

Application filed March 5, 1880.

To all whom it may concern Be it known that I, ARTHUR P. SPRAGUE, ofKalamazoo, in the county of Kalamazoo and State of Michigan, haveinvented a new and useful Improvement in Spring Harrow- Teeth, of whichthe following is a specification.

The object of this invention is to furnish spring harrow-teeth soconstructed that they may be secured adjustably to the bars of thebarrow-frame, will be firmly and securely held,.

can be readily adjusted, and will economize steel in their manufacture.

Figure l is a sectional side elevation of the improvement. Fig. 2 is afront elevation. Fig. 3 is a sectional plan view taken through the line00 a', Fig. 1. Fig. 4 is a plan view of a part of a barrow-frame bar.

Similar letters of reference indicate corresponding parts.

A represents the barrow-tooth, which is bent into U form, with itsforward arm the longer. The arms of the tooth A are curved into the arcsof concentric circles, as shown in Fig. 2. The short arm or shank of thetooth A is inserted in a socket, B,"in a holder, where it is secured inplace by wedges O D and a setscrew, E. The forward part of the socket Bis so formed as to fit upon the short arm or shank of the tooth A. Therear part of the socket B is curved or tapered from its middle parttoward its side edges to receive the two wedges 0, so that thetooth-shank may be clamped in place by forcing the said wedges apart ortoward the side edges of the socket B. The wedges O are beveled alongthe outer side of their inner edges to receive the third wedge, D, whichfits into the space between the wedges G and the rear side of the socketB. The set-screw E passes through the rear side of the socket B andrests against the middle part of the wedge D, so that when the setscrewE is turned forward it will force the wedge D against the Wedges O, andpress them outward, securely clamping the tooth A in the socket Upon therear side of the lower end of the socket B is formed a plate, shank, orflange, F,

(No model.)

which projects at an angle with the socket B, rests upon the bar G ofthe harrow-frame, and has a hole through its middle part to receive thebolt H, which passes through it and through the said frame-bar G.

Upon the lower side of the plate or flange F are formed two points, I,which enter holes in the frame-bar G to prevent the holder B F fromturning upon the bolt H, so that the said holder can be secured to theframe-bar by a single bolt. Several holes are formed in the frame-bar Gto receive the points I, so that the tooth may be adjusted to passsquarely through the ground, or to have a lateral inclination, as thecharacter of the soil may require.

W'ith this construction a slight movement of the short arm of the toothA in the socket B will give a much longer movement to the point of thetooth, so that it may be adjusted to enter the ground to any desireddepth, as the work to be done may require.

Having thus fully described my invention, I

claim as new and desire to secure by Letters Patent? 1. A springharrow-tooth constructed substantially as herein shown and described,consisting of the tooth A, made in U form, with unequal arms, and withits arms curved in the arcs of concentric circles, the socket B, havingwedges O O D and set-screw E, the inclined plate or flange F, havingpoints I, and the bolt H, whereby the barrow-tooth can be securedadjustably to the frame-bar, as set forth.

2. In a spring harroW-tooth, the tooth A, made in U form, with unequalarms, and with its arms curved upon the arcs of concentric circles,substantially as herein shown and described, whereby a slight movementin the holder will give a longer movement to the point of the tooth, asset forth.

3. The combination, with the socket B, of the three wedges O (J D andscrew'E, to hold a barrow-tooth, as described.

ARTHUR P. SPRAGUE.

Witnesses:

GEORGE F. GREEN, W. S. WHITE.

